linux-kernel - [RFC v4 2/5] parisc: Drop linux/kernel.h include from asm/bug.h header

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <c36756368f0ee942d5a995a603ce290eba06a5b6.1760999284.git.fthain@linux-m68k.org>
Date: Tue, 21 Oct 2025 09:28:04 +1100
From: Finn Thain <fthain@...ux-m68k.org>
To: Peter Zijlstra <peterz@...radead.org>,
    Will Deacon <will@...nel.org>,
    "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
    Helge Deller <deller@....de>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
    Arnd Bergmann <arnd@...db.de>,
    Boqun Feng <boqun.feng@...il.com>,
    Geert Uytterhoeven <geert@...ux-m68k.org>,
    linux-arch@...r.kernel.org,
    linux-kernel@...r.kernel.org,
    linux-m68k@...r.kernel.org,
    Mark Rutland <mark.rutland@....com>,
    linux-parisc@...r.kernel.org
Subject: [RFC v4 2/5] parisc: Drop linux/kernel.h include from asm/bug.h
 header

This patch series will add WARN_ON_ONCE() calls to the header file
linux/instrumented.h. That requires including linux/bug.h,
but doing so causes the following compiler error on parisc:

In file included from ./include/linux/atomic/atomic-instrumented.h:17,
                 from ./include/linux/atomic.h:82,
                 from ./arch/parisc/include/asm/bitops.h:13,
                 from ./include/linux/bitops.h:67,
                 from ./include/linux/kernel.h:23,
                 from ./arch/parisc/include/asm/bug.h:5,
                 from ./include/linux/bug.h:5,
                 from ./include/linux/page-flags.h:10,
                 from kernel/bounds.c:10:
./include/linux/instrumented.h: In function 'instrument_atomic_alignment_check':
./include/linux/instrumented.h:69:9: error: implicit declaration of function 'WARN_ON_ONCE' [-Werror=implicit-function-declaration]
   69 |         WARN_ON_ONCE((unsigned long)v & (size - 1));
      |         ^~~~~~~~~~~~
cc1: some warnings being treated as errors
make[3]: *** [scripts/Makefile.build:182: kernel/bounds.s] Error 1

The problem is, asm/bug.h indirectly includes atomic-instrumented.h,
which means a new cycle appeared in the graph of #includes. And because
some headers in the cycle can't see all definitions, WARN_ON_ONCE()
appears to be an undeclared function.

This only happens on parisc and it's easy to fix. In the error
message above, linux/kernel.h is included by asm/bug.h. But it's no
longer needed there, so remove it.

The comment about needing BUGFLAG_TAINT seems to be incorrect as of
commit 19d436268dde ("debug: Add _ONCE() logic to report_bug()"). Also,
a comment in linux/kernel.h strongly discourages its use here.

Compile-tested only.
---
 arch/parisc/include/asm/bug.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/parisc/include/asm/bug.h b/arch/parisc/include/asm/bug.h
index 833555f74ffa..dbf65623c513 100644
--- a/arch/parisc/include/asm/bug.h
+++ b/arch/parisc/include/asm/bug.h
@@ -2,8 +2,6 @@
 #ifndef _PARISC_BUG_H
 #define _PARISC_BUG_H
 
-#include <linux/kernel.h>	/* for BUGFLAG_TAINT */
-
 /*
  * Tell the user there is some problem.
  * The offending file and line are encoded in the __bug_table section.
-- 
2.49.1